Derivative Financial Instruments (Details Textual)	3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended
	Jul. 01, 2012 USD ($)	Jul. 01, 2012 USD ($) agreement	Jul. 01, 2012 AUD	Jan. 01, 2012 USD ($)	Jul. 01, 2012 Fair Value Hedging [Member] Interest Rate Swap [Member] USD ($)	Jul. 01, 2012 Fair Value Hedging [Member] Interest Rate Swap [Member] USD ($)	Jul. 01, 2012 Minimum [Member]	Jul. 01, 2012 Maximum [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (loss) recongized and recorded in earnings related to fair value hedge					$ (100,000)	$ 200,000
Interest Rate Swaps [Abstract]
Notes bear interest at a rate	7.75%	7.75%
Notional amount coincide with the terms of the non-recourse debt	100,000,000	100,000,000
Interest Rate Swap Agreements			50,900,000
Variable interest rate payment to the same counterparties							4.16%	4.29%
Ineffective portion of Fair value interest rate swap		0
Derivative Financial Instruments [Abstract]
Number of Interest Rate Swap Agreements		4
Fair value of the swap assets included as Other Non-Current Assests	7,300,000	7,300,000		7,400,000
Fixed interest rate on cash flow interest rate derivative	9.70%	9.70%
Net unrealized loss recognized in the periods and recorded in accumulated other comprehensive income, net of tax	400,000	400,000
Fair value of the swap assets (liabilities) recorded as a component of other assets (liabilities)	(600,000)	(600,000)		0
Ineffective portion of Cash Flow Hedge interest rate swap		$ 0